TROJ_BOAXXE.NF
Trojan:Win32/Boaxxe.E (Microsoft); [2.nsis]:Generic.dx!bg3o (McAfee); Trojan.ADH (Symantec); Trojan.Win32.Genome.agpnc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
220,027 bytes
EXE
Yes
27 Dec 2012
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{405DA3F3-1769-073C-6A87-B8123C741FB4}
It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\mcymprod
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\mcymprod\Parameters
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsl1.tmp
- %System%\DLL321.dll.bak
- %System%\amyohsjn.dll
- %System%\amyohsjn.dat.bak
- %System%\sonicuzi.dll
- %System%\sonicuzi.dat.bak
- %System%\nixgzgzb.dll
- %System%\nixgzgzb.dat.bak
- %System%\gykyaftp.dll
- %System%\gykyaftp.dat.bak
- %System%\bogcimhq.dll
- %System%\bogcimhq.dat.bak
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Dzsqfvpa
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Dzsqfvpa\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
ShellIconOverlayIdentifiers\Enhanced Storage
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
Description = "Monitor for NDIS System"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
DisplayName = "NDIS System Monitor"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod
Type = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod\Parameters
ServiceDll = "%System%\DLL321.dll"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\mcymprod\Parameters
ServiceMain = "DllRegisterServer"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
Version = "68"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
Flags = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
netsvcs = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "0"
Dropping Routine
This Trojan drops the following files:
- %System%\DLL321.dll
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
This report is generated via an automated analysis system.
SOLUTION
9.300
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Close all opened browser windows
Step 4
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- mcymprod
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\mcymprod
- Parameters
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {405DA3F3-1769-073C-6A87-B8123C741FB4}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
- Dzsqfvpa
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Dzsqfvpa
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers
- Enhanced Storage
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- Description = "Monitor for NDIS System"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- DisplayName = "NDIS System Monitor"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- ObjectName = "LocalSystem"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod
- Type = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod\Parameters
- ServiceDll = "%System%\DLL321.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mcymprod\Parameters
- ServiceMain = "DllRegisterServer"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
- Version = "68"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{405DA3F3-1769-073C-6A87-B8123C741FB4}
- Flags = "1"
Step 6
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
- From: netsvcs = "{random characters}"
To: netsvcs = ""{random values}""
- From: netsvcs = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
- DisableSR = "0"
Step 7
Search and delete this file
- %System%\DLL321.dll
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BOAXXE.NF. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Temp%\nsl1.tmp
- %System%\DLL321.dll.bak
- %System%\amyohsjn.dll
- %System%\amyohsjn.dat.bak
- %System%\sonicuzi.dll
- %System%\sonicuzi.dat.bak
- %System%\nixgzgzb.dll
- %System%\nixgzgzb.dat.bak
- %System%\gykyaftp.dll
- %System%\gykyaftp.dat.bak
- %System%\bogcimhq.dll
- %System%\bogcimhq.dat.bak
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